Erick,
You can use erasure coding but it has to be fronted by a replicated cache tier, or so states the documentation, I have never set up this configuration, and always opt to use RBD directly on replicated pools.
On Fri, Sep 16, 2016 at 1:15 AM, Josh Durgin <jdurgin@xxxxxxxxxx> wrote:
On 09/16/2016 09:46 AM, Erick Perez - Quadrian Enterprises wrote:
Can someone point me to a thread or site that uses ceph+erasure coding
to serve block storage for Virtual Machines running with Openstack+KVM?
All references that I found are using erasure coding for cold data or
*not* VM block access.
Erasure coding is not supported by RBD currently, since EC pools only support append operations. There's work in progress to make it
possible, by allowing overwrites for EC pools, but it won't be usable
until at earliest Luminous [0].
Josh
[0] http://tracker.ceph.com/issues/14031
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Respectfully,
Wes Dillingham
Research Computing | Infrastructure Engineer
Harvard University | 38 Oxford Street, Cambridge, Ma 02138 | Room 210
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